Home / 1,355.36-1,867.20-1,117.76

Finding the Fourth Proportional to 1,355.36, 1,867.20 and 1,117.76

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Solution

The fourth proportional to 1,355.36, 1,867.20 and 1,117.76 is: 1,539.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.36 : 1,867.20 = 1,117.76 : x
  2. Step 2: Convert to fraction form
    1,355.36/1,867.20 = 1,117.76/x
  3. Step 3: Cross multiply
    1,355.36x = 1,867.20 × 1,117.76
  4. Step 4: Simplify right side
    1,355.36x = 2,087,081.47
  5. Step 5: Solve for x
    x = 2,087,081.47/1,355.36
  6. Step 6: Final answer
    x = 1,539.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.